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Reports assignment expressions that are nested inside other expressions.
<p>Such expressions may be confusing and violate the general design principle, which states that any construct should do precisely one thing.</p>
<p><b>Example:</b></p>
<pre><code>
  String userName;
  // Warning: result of assignment to 'userName' is used
  String message = "Hello " + (userName = "Alice") + "!"
  System.out.println(message);
  System.out.println("Goodbye " + userName);
</code></pre>
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